Last reviewed: June 2026 · For use in England & Wales · eLitigant is a Community Interest Company (No. 16566612), not a law firm. Always check the current official form on GOV.UK before you file, and sign the statement of truth yourself.
Official form & guidance: Form ET1 (Make a claim to an employment tribunal) →
In short
A whistleblowing claim is brought on Form ET1 under the Public Interest Disclosure Act 1998 — for detriment under section 47B or automatically unfair dismissal under section 103A of the Employment Rights Act 1996, where you were treated badly because you made a protected disclosure. There is no qualifying period and compensation is uncapped, but you must first complete ACAS Early Conciliation and file within three months minus one day of the detriment or dismissal. In Section 8, set out the disclosure, the public interest, the detriment or dismissal, and the remedy, in clear chronological order. eLitigant’s Chris drafts this for you to a professional standard — you check, sign and file.
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If you have been dismissed, demoted, or treated unfairly at work because you reported wrongdoing, you may have a whistleblowing claim under the Public Interest Disclosure Act 1998. Unlike standard unfair dismissal, there is no qualifying period of employment required. You can bring a claim from day one, and if you succeed, compensation is uncapped. This guide explains exactly what a whistleblowing claim involves, how to complete your ET1, and what steps to take before the deadline passes.
When Do You Need to File a Whistleblowing Claim?
You need to file a whistleblowing Employment Tribunal claim when your employer has subjected you to a detriment — or dismissed you — because you made a protected disclosure. A protected disclosure is a disclosure of information which you reasonably believe shows one or more of the following:
- A criminal offence has been committed, is being committed, or is likely to be committed
- A person has failed, is failing, or is likely to fail to comply with a legal obligation
- A miscarriage of justice has occurred, is occurring, or is likely to occur
- The health or safety of any individual has been, is being, or is likely to be endangered
- The environment has been, is being, or is likely to be damaged
- Information falling into any of the above categories has been deliberately concealed
The disclosure must also be made in the public interest. You do not have to be the person directly affected. You do need to have a reasonable belief that the information is substantially true at the time you disclosed it — you do not need to prove that the wrongdoing actually occurred.
The claim must be filed within three months minus one day of the act of detriment or the effective date of termination (if you were dismissed). If you have experienced a series of acts of detriment, time generally runs from the most recent act. You must also notify ACAS under Early Conciliation before submitting your ET1 to the tribunal.
What a Whistleblowing Claim Involves
A whistleblowing claim can take two forms. First, a claim of automatically unfair dismissal under section 103A of the Employment Rights Act 1996, where the principal reason for your dismissal was that you made a protected disclosure. This is automatically unfair regardless of how long you have been employed. Second, a claim of detriment under section 47B of the Employment Rights Act 1996, where your employer subjected you to some form of less favourable treatment — for example, disciplinary action, demotion, exclusion from meetings, changes to duties, or a hostile working environment — short of dismissal.
You may bring both types of claim on the same ET1 form if you were ultimately dismissed following a period of detriment. Awards in whistleblowing cases are uncapped for compensation, meaning there is no statutory limit equivalent to that which applies in ordinary unfair dismissal claims. Injury to feelings may also be awarded in detriment claims. These factors make whistleblowing claims potentially high-value, but also vigorously contested by employers. The quality of your ET1 matters greatly.
How to Complete Your ET1 for Whistleblowing: Step by Step
Your ET1 form is the foundation of your case. Every element you include — or fail to include — shapes how the tribunal and your employer respond. The following guidance covers the key sections.
Section 1: Your details
Complete your name, address, date of birth, and contact details accurately. Ensure you enter the correct address for correspondence throughout the proceedings.
Section 2: Respondent’s details
Enter your employer’s full legal name and registered address, not just the trading name. If there are multiple respondents — for example, if a co-worker personally subjected you to detriment and you wish to name them — each must be listed separately. Incorrectly identifying the respondent is a common and costly error.
Section 3: Multiple cases
If you are aware of other employees bringing similar claims against the same employer, indicate this. The tribunal may consolidate cases, which can support your credibility and reduce individual legal costs.
Section 4: Employment details
State your start date, the date your employment ended (if applicable), your job title, and your pay. If you are still employed and bringing a detriment-only claim, state that you remain in post. Accuracy here matters because compensation calculations are based on weekly pay.
Section 5: Unfair or constructive dismissal
If you were dismissed, select the unfair dismissal option. In the reason box, state clearly that you are bringing a whistleblowing claim under section 103A of the Employment Rights Act 1996. Do not simply describe it as ordinary unfair dismissal. Identifying the statutory basis correctly signals to the tribunal the nature of your claim from the outset.
Section 6: Discrimination
If your whistleblowing detriment also involved any form of discrimination — for example, if you raised concerns about discriminatory practices and were then treated differently because of a protected characteristic — include a discrimination claim here. These claims can run concurrently with whistleblowing.
Section 8: Type and details of claim
This is the most important section. You must set out your claim clearly, factually, and in chronological order. Cover the following in sequence:
- The protected disclosure itself. State what information you disclosed, when you disclosed it, and to whom. Be specific — quote dates, names of recipients, and the method of disclosure (for example, written email on a specific date, verbal report to a named line manager). Identify which category of wrongdoing from the PIDA 1998 your disclosure relates to. Explain why you reasonably believed the information showed that wrongdoing.
- The public interest element. Briefly explain why the disclosure was in the public interest — for example, it concerned health and safety risks to colleagues, financial fraud against customers, or a regulatory breach affecting members of the public.
- The detriment or dismissal. Set out each act of detriment in chronological order. For dismissal, state the date of dismissal, the reason given by your employer, and why you believe the true reason was your protected disclosure. Draw a clear causal link between the disclosure and the employer’s response.
- The remedy you seek. State that you seek reinstatement or re-engagement (if dismissed and you want your job back), compensation for loss of earnings, compensation for injury to feelings (detriment claims only), and any other losses flowing from the dismissal or detriment.
Keep the narrative factual and measured. Avoid emotional language. Present the tribunal with a clear, logical account that demonstrates cause and effect.
Before submitting
Check that you have your ACAS Early Conciliation certificate number. You cannot submit your ET1 without it. Ensure you have signed the declaration and that all dates are accurate.
Key Deadlines
| Step | Deadline |
|---|---|
| ACAS Early Conciliation notification | Before the ET1 limitation date |
| ET1 submission | Three months minus one day from the act of detriment or the effective date of termination |
| Extension | Only granted where it was not reasonably practicable to comply — a high bar |
The limitation period is strict. Tribunals have limited discretion to extend time in whistleblowing cases, and the test — whether it was not reasonably practicable to present the claim in time — is difficult to meet. Do not delay. If your situation is complex or involves multiple acts of detriment, seek to calculate the correct date carefully. Where there is a series of acts, time runs from the last act unless the earlier acts form a distinct and separate complaint.
What Happens After You File?
Once your ET1 is submitted, the tribunal will send a copy to your employer (the respondent), who will have 28 days to submit an ET3 response. If the respondent does not file an ET3, the tribunal may make a default judgment in your favour.
After the ET3 is received, the tribunal will issue a Case Management Order. You will typically be required to attend a Preliminary Hearing to identify the issues, agree a timetable for disclosure of documents, and set a date for the Final Hearing. In whistleblowing cases, a preliminary hearing may also determine whether your disclosure qualifies as protected — this is known as a jurisdictional question, and the tribunal may rule on it before the substantive merits are heard.
During the process you will be required to exchange documents with the respondent, produce a witness statement, and prepare a bundle of documents for the final hearing. The complexity of whistleblowing cases means that hearings are often listed for two to five days.
Common Mistakes
1. Failing to identify the statutory basis of the claim
Describing your claim as simply unfair dismissal without citing section 103A or section 47B of the Employment Rights Act 1996 can cause the tribunal to treat it as an ordinary claim with a qualifying period. Always name the provision.
2. Vague description of the protected disclosure
Saying “I raised concerns about health and safety” is not enough. You must state what specific information you disclosed, the date and method of disclosure, and why you believed it fell within a PIDA category.
3. Missing the ACAS Early Conciliation step
You cannot submit an ET1 without completing the ACAS Early Conciliation process first. Attempting to bypass this step will result in the claim being rejected.
4. Miscalculating the limitation date
Three months minus one day is not the same as three calendar months. Count back carefully. If the act occurred on 15 January, the deadline is 14 April — not 15 April.
5. Naming the wrong respondent
Filing against a trading name rather than the legal entity, or failing to name the correct employing company within a group, can result in the claim failing on jurisdictional grounds or being struck out against that respondent.
6. Conflating whistleblowing with other grievances
A protected disclosure must concern one of the six categories under PIDA. Complaints about personal grievances — such as unfair treatment unrelated to wrongdoing — do not qualify. Including non-qualifying disclosures does not strengthen the claim and may undermine credibility.
A: No. There is no qualifying period for whistleblowing claims. You can bring a claim under section 103A or section 47B of the Employment Rights Act 1996 from the first day of employment, or even before employment begins if the detriment relates to a pre-employment disclosure.
Q: Is there a cap on compensation in whistleblowing cases?
A: No. Unlike ordinary unfair dismissal, compensation in whistleblowing cases is uncapped. Awards can include loss of earnings (past and future), loss of pension, injury to feelings in detriment cases, and aggravated damages where the employer’s conduct has been particularly egregious.
Q: What counts as a protected disclosure — does my concern have to be proven true?
A: No. You must hold a reasonable belief that the information you disclosed tended to show wrongdoing within one of the PIDA categories, and that the disclosure was in the public interest. You do not have to prove the wrongdoing occurred. However, if you knowingly disclosed false information, protection will not apply.
Q: Can I bring a whistleblowing claim if I am still employed and have not been dismissed?
A: Yes. Section 47B of the Employment Rights Act 1996 protects workers from detriment short of dismissal. If you have been subjected to disciplinary action, demotion, exclusion, changes to your role, or a hostile working environment because of a protected disclosure, you can bring a detriment claim while remaining in employment.
Q: What if I raised concerns internally but my employer dismissed them — does that still count as a protected disclosure?
A: Yes, provided you held a reasonable belief that the information showed wrongdoing within a PIDA category and the disclosure was in the public interest. A disclosure made to your employer or to a manager responsible for the alleged wrongdoing is the most straightforward route and does not require any particular formality. An email or written record of the concern is the strongest evidence, but a verbal disclosure can also qualify.
Related Court Forms & Guides
- Form N260: Statement of Costs — the costs schedule used at summary assessment.
- Form N244: Application Notice — the form for interim applications.
- Start a Money Claim Online (OCMC) — where most civil money claims begin.
- Particulars of Claim — setting out the basis of your claim.
- Civil Court Forms Index — every civil court form guide in one place.
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Frequently asked questions
Do I need a minimum length of employment to bring a whistleblowing claim?
No. There is no qualifying period for whistleblowing claims. You can bring a claim under section 103A or section 47B of the Employment Rights Act 1996 from the first day of employment, and in some cases even before employment begins where the detriment relates to a pre-employment disclosure.
What is a protected disclosure?
It is a disclosure of information you reasonably believe shows wrongdoing in one of the six PIDA categories — a criminal offence, a failure to comply with a legal obligation, a miscarriage of justice, a danger to health or safety, damage to the environment, or the deliberate concealment of any of these. The disclosure must also be made in the public interest, and you do not have to prove the wrongdoing actually occurred.
Is there a cap on compensation in whistleblowing cases?
No. Unlike ordinary unfair dismissal, compensation in whistleblowing cases is uncapped. Awards can include loss of earnings past and future, loss of pension, injury to feelings in detriment cases, and aggravated damages where the employer’s conduct warrants it.
Can I claim if I am still employed and have not been dismissed?
Yes. Section 47B of the Employment Rights Act 1996 protects workers from detriment short of dismissal — such as disciplinary action, demotion, exclusion, changes to your role, or a hostile working environment imposed because you made a protected disclosure.
Do I have to contact ACAS before filing my ET1?
Yes. You must complete ACAS Early Conciliation first and have your certificate number — you cannot submit an ET1 without it. Attempting to bypass this step results in the claim being rejected.
How strict is the time limit?
The claim must generally be filed within three months minus one day of the act of detriment or the effective date of termination. Where there is a series of acts, time generally runs from the most recent. The limitation period is strict and tribunals have limited discretion to extend it, so check the current figure for your situation and do not delay.
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Related guides: Particulars of Claim · Form N244: Application Notice · Form N260: Statement of Costs · All civil court forms
Form content and official guidance on this page are reproduced or adapted from material published by HM Courts & Tribunals Service on GOV.UK. Contains public sector information licensed under the Open Government Licence v3.0. eLitigant CIC is independent and is not affiliated with, or endorsed by, HM Courts & Tribunals Service or any government department. Always check the current official form on GOV.UK before you file.